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3. The mainboard's sensors

3.1 Getting the drivers

Get the lm_sensors 2.6.2 or more recent: http://www.lm-sensors.nu/archive/lm_sensors-2.6.2.tar.gz You'll need kernel sources too in order to compile that one.

3.2 Installing them

tar -xzvf i2c-2.6.2.tar.gz

cd i2c-2.6.2

make && make install

Then there was a problem when making install for me, so if it doesn't work, just do the following:

cp kernel/i2c-core.o /lib/modules/`uname -r`/misc/i2c-core.o

cp kernel/i2c-proc.o /lib/modules/`uname -r`/misc/i2c-proc.o

Now let's copy the specific driver:

cp kernel/chips/it87.o /lib/modules/`uname -r`/misc/it87.o

ok now

cp prog/sensors/sensors /usr/bin/sensors

--------------------------------------------------------------------

Edit /etc/modules.conf and add to it the following lines:

alias char-major-89 i2c-dev

options it87 temp_type=0x31

now:

modprobe i2c-proc

modprobe it87

modprobe i2c-isa

sensors

should output you some data

When it works, you can write it to a file, that will be loaded automatically on boot. Under SuSE the file is: /etc/init.d/boot.local (used to be /sbin/init.d/) and you should just add: sensors -s Under mandrake, the install should have created that file: /etc/init.d/sensors, which you can edit freely, sensord being just a daemon to watch over temperature and fan speed, I assume no one will need something like that for her/his own machine.

Now as root you should edit your /etc/sensors.conf search for that line: chip "it87-*" and below you should be able to modify everything to get the right data, here is a copy of what i have in there: (please note that temp1 is trash and only temp2 and temp3 should be kept)

--------------------------------------------------------------------

chip "it87-*"



# The values below have been tested on Asus CUSI, CUM motherboards.

# Voltage monitors as advised in the It8705 data sheet



    label in0 "VCore"

    label in1 "Vcc2.5v"

    label in2 "Vcc5v"

    label in3 "+5V"

    label in4 "+12V"

    label in5 "-12V"

    label in6 "-5V"

    label in7 "SB 5V"

    label in8 "V battery"



    set in0_min 1.7 * 0.95

    set in0_max 1.7 * 1.05

    set in1_min 2.4

    set in1_max 2.6

    set in2_min 3.3 * 0.95

    set in2_max 3.3 * 1.05

    set in3_min 5.0 * 0.95

    set in3_max 5.0 * 1.05

    set in4_min  12 * 0.95

    set in4_max  12 * 1.05
    set in5_min -12 * 0.95

    set in5_max -12 * 1.05

    set in6_min  -5 * 0.95

    set in6_max  -5 * 1.05

    set in7_min   5 * 0.95

    set in7_max   5 * 1.05



    # vid not monitored by IT8705F

    ignore  vid



# For this family of chips the negative voltage equation is different from

# the lm78.  The chip uses two external resistor for scaling but one is

# tied to a positive reference voltage.  See ITE8705/12 datasheet (SIS950

# data sheet is wrong)


# Vs = (1 + Rin/Rf) * Vin - (Rin/Rf) * Vref.

# Vref = 4.096 volts, Vin is voltage measured, Vs is actual voltage.



#    compute in2 (1 + 1)*@ ,       @/(1 + 1)

    compute in3 ((6.8/10)+1)*@ ,  @/((6.8/10)+1)

    compute in4 ((30/10) +1)*@  , @/((30/10) +1)



# The next two are negative voltages (-12 and -5).

# The following formulas must be used. Unfortunately the datasheet

# does not give recommendations for Rin, Rf, but we can back into

# them based on a nominal +2V input to the chip, together with a 4.096V Vref.



# Formula:

#    actual V = (Vmeasured * (1 + Rin/Rf)) - (Vref * (Rin/Rf))
#    For -12V input use Rin/Rf = 6.68

#    For -5V input use Rin/Rf = 3.33

# Then you can convert the forumula to a standard form like:



    compute in5 -(36/10)*@, -@/(36/10)

#(7.67 * @) - 27.36  ,  (@ + 27.36) / 7.67

    compute in6 -(56/10)*@, -@/(56/10)

#(4.33 * @) - 13.64  ,  (@ + 13.64) / 4.33

    compute in7 ((6.8/10)+1)*@ ,  @/((6.8/10)+1)



# Temperature



    label temp3       "Processor"

    set   temp3_over  40

    set   temp3_hyst  20

    label temp2       "Mainboard"

    set   temp2_over  45

    set   temp2_hyst  25

    ignore temp1



# Fans



    label fan1"Processor's Fan"

    set fan1_min 2000

    ignore fan3

    ignore fan2

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